How do I mass-remove UV maps from multiple objects?
You can use the following script:

import bpy

selected = bpy.context.selected_objects

bad_uvmap = 'UVMap.001' # Enter the UV map name you want to remove here

for obj in selected:
    try:
        badUV = obj.data.uv_textures[ bad_uvmap ]
        obj.data.uv_textures.remove( badUV )
    except:
        pass



Paste it in the text editor (open a text editor view, use the "new" button and paste).
Change the line "bad_uvmap = 'UVMap.001'" by replacing 'UVMap.001' by the name of the UV map you want to remove
Select all the concerned objects in the 3D view
Come back to the text editor and use 'run script' or AltP